Ch1b09Lecture08

Ch1b09Lecture08 - Today: Mass Spectrometry Electronic...

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Today: Mass Spectrometry Electronic Spectroscopy Clicker Questions Chemistry in Context
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1 11 1 2 1 1 3 3 1 Why Pascal’s triangle? -CH 3 Take the case of a splitting by 3 equivalent H-atoms
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C 5 H 10 O 1 H NMR spectra of diethylketone CH 3 CH 2 C O CH 2 CH 3 04-9
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Mass Spectrometry A Powerful Tool for Chemical Analysis and Molecular Structure Determination Organic Compounds in Peet’s Coffee Caffeine 04-12 OGC pp. 19-21 www.cem.msu.edu/~reusch/VirtualText/Spectrpy/ MassSpec/masspec1.htm
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Mass Spectrometry “Mass spectrometry is the art of weighing individual atoms and molecules to determine their masses or molecular weights. Such mass or weight information is sometimes sufficient, frequently necessary, and always useful in determining the identity of a species.” - John Fenn “…Mass spectrometry is the method of choice… when all other methods have failed.” - Fred McLafferty 04-13
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Basic Mass Spectrometer Ions are generated (in this case by electron ionization (EI)); accelerated in a strong electric field and deflected in a magnetic field according to their mass and charge; and recorded on a detector. 04-14
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Physics of mass spectrometry accelerating plates 1 2 mv 2 = zeV ; v = 2 zeV m magnetic sector forces zevB = mv 2 r ; eBr v = m z combine m z = eB 2 r 2 2 V for fixed V and r (slits), m/z may be scanned by varying B 04-15 m = mass v = velocity z = valence charge (+1, etc) e = proton charge V = accelerating voltage r = radius B = magnetic field
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Mass spectrometer components Ionization Sample + + Mass Analysis Detection Electron ionization (EI) Chemical ionization (CI) Photoionization Fast atom bombardment Field ionization Atmospheric pressure CI Particle impact Electrospray MALDI DART (most recent) ….
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Ch1b09Lecture08 - Today: Mass Spectrometry Electronic...

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